Tool-holding attachment



T. B. MURPHY.

TOOL HOLDING ATTACHMENT FOR GRINDING MACHINES. APPLICATIOMTILED on. 18. 1920. 1,400,7 2., Patented Dec. 20, 192 1.

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TOOL HOLDING ATTACHMENT FOR GRINDING MACHINES.

APPLICATION FILED OCT 18, 1920.

1,400,762. Patented Dec. 20, 1921.

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TOOL HOLDING ATTACHMENT FOR GRINDING MACHINES.

APPLICATION FILED ocr. 13, I920.

1,400,762. Patented Dec. 1921.

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abtmwuao UNITED STATME- THOMAS B. liIURPI-IY, 0F DETROIT, MICHIGAN.

TOOL-HOLDING ATTACHMENT FOR GRINDING-MACHINES.

Specification of Letters Patent.

Patented Dec. 20, 1921.

Application filed October 18. 1920. Serial No. 117.616.

To all whom it may concern:

Be it known that I, THOMAS B. MURPHY, a citizen of the United States, residin at Detroit, in the county of Wayne and S tate of Michigan, have invented certain new and useful Improvements in Tool-Holding A tachments for Grinding-Machines; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an improved grinder for use in connection with grinding a cutting end upon a die forming tool known as'a chaser, and one object of the invention is to provide a device of the character de scribed so constructed that it may be connected with a lathe in front of an emery wheel and properly adjusted to bring the end of the thread chaser-into engagement with the peripheral face of the emery wheel.

Another object of the invention is to so construct this device that it may be vertically adjusted for proper adjustment according to the size of wheel in use and further permit of it being swung toward and away from the wheel. thus permitting it to be positioned parallel to the shaft carrying the wheel.

Another object of the invention is to pro vide an improved type of block upon which the die chaser will rest while being ground,

, the block having end portions cut longitudinally for proper engagement with the underface of the die chaser and having a central portlon carrying an adjustably mounted strip upon which the die chaser will rest during the first cutting action.

Another object of the invention is to pro vide improved abutment means adjustably mounted and positioned beyond the inner end of the block for engagement by the die chaser during the finishing cut, adjustment of the stop regulating the amount the die chaser bar may be out before striking the abutment.

Another object of the invention is to provide improved means for slidably mounting the block transversely of the peripheral face of the emery wheel.

Another object of the invention is to provide an attachment of the character described which can be used in connection with the conventional structure of emery wheel lathe.

The invention is illustrated in the accompanying drawings wherein:

Figure 1 is a view in front elevation showing the device applied to an emery wheel stand.

Fig. 2 is a top plan view of the structure shown in Fig. 1.

Fig. 3 is a view in side elevation of the structure shown in Fig. 2.

Fig. 4 is a sectional view taken along the line -la of Fig 2.

Fig. 5 is a sectional view taken along the line 55 of Fig. 4:.

Fig. 6 is a sectional view taken along the line 66 of Fig. d.

Fig. 7 is a perspective view showing the die chaser after being ground and looking at the ground face.

This attachment is used in connection with a stand 1 having bearings 2 at its upper end for rotatably mounting a shaft 3 which carries a pulley wheel 4: and a grinding wheel 5 which will be formed of emery or any other suitable material. This stand is provided with the usual 6 and this arm will. be provided with a rib 7 which extends longitudinally of the arm. It will thus be seen that this stand is of a conventional construction.

The grinder attachment is provided with a bearing bracket 8 which rests upon the arm 6 and is provided with a longitudinally extending groove 9 to receive the rib 7 and is further provided at its outer end with jaws 8 having end extensions 10 through which will pass a screw 11 by means of which the jaws of this bearing bracket may be brought into tight binding engagement with the shank or stem 12 of a socket 13. This socket can therefore be vertically adjusted and releasably held in the set posltion. The socket is split and provided with upstanding ears 14L through which will pass a securing screw 15 and therefore a shaft or bar 16 which passes through this socket may be securely gripped and thus releasably held in a set position and prevented from having longitudinal or rotary movement in the socket. This shaft or bar 16 is provided with a longitudinally extending groove or keyway 17 and will further be provided with an indicating mark 18 so that by turn ing the shaft to bring the mark 18 into proper position with relation to the gage marks 19 of the socket 13 the shaft may be secured in the proper position. The socket 13 is provided with a mark 20 which corresponds to the mark 18 and will be used in connection with the gage markings 21 of the bearing bracket 8 for properly positioning the socket.

The block 22 is slidably mounted upon the shaft or bar 16 and is provided with a key 23 which fits into the key-way 17 and prevents this block from rotating upon the shaft. It is desired to provide means for limiting sliding movement of the block upon the shaft and therefore there has been provided collars 24; which are mounted upon the shaft upon opposite sides of the block. Each of these collars is split and provided with a tightening screw 25 so that the collars may be tightly secured about the shaft and further each collar is provided with a set-screw 26 which extends transversely through the collar for engaging the side of the block 22. 'lherefore the block can be moved upon the shaft to position the seat 31 in front of the wheel 5 and the collars.

then placed in spaced relation to the bloclr and secured by means of the screws 25. The block may then have sufficient movement to permit the seats 28 to be moved partial in front of the grinding wheel, the set-screv-Is 26 permitting accurate gaging. This block has its upper face cut to provioe a central seat 27 and side seats 2%.}, the central seat being divided from the end seats b the partition 29, and the side seats 28 having a greater pitch then the central seat. it will be further noted that the sine or end sea s 28 are additionally cut thus providing led e 30 adjacent the partition A. strip 31 upon which the tool to be ground is adapts to rest is positioned in the seat 21 and pivotally mounted by means of a pin this pin being positioned in an opening formed in the block and the pin being held against moving out of the opening receiving the same by means of threaded pins which are screwed into the block and close the opening in which the pin is mounted. These stems or threaded pins carry abutment nuts 3% and springs 35. are provided upon these threaded stems so that the nuts will be frictionally engaged by the springs and prevented from readily turning. set-screw 36 passes through the block as shown in Fig. 5 and eng es the strip 31 so that this strip may be supported the desired angle.

When this device is in use, the bearing arm 6 passes bracket 8 is put in place upon the and secured by the bolt 3'? which through the slot 38, the bracket being at first left somewhat loose so that it can be moved to the proper position according to the size of the emery wheel After the bracket has been put in place, tl e socketwill be turned in its bearing to extend the shaft 16 parallel to the shaft 3 and the securing screw 11 will be tightened. If it is found that the block 22 is positioned too high or too low, the screw 11 will be loosened and the socket will be vertically adjusted and the screw then again tightened. The collars will be loosened and the block moved longitudinally of the bar 16 to bring the central seat in front of the peripheral face of the grinding wheel and the collars then again tightened and the set-screws 26 brought into engagement with the sides of the block. The bar of tool steel which is to beground to form the chaser 39 of Fig. '7 will then be placed upon the strip 31 and t e set-screw 36 adjusted to position the bar 39 horizontally. The bar will then be moved forwardly so that its end will engage the grinding wheel and the end face of the bar will. be ground with a hollow grind. This first grind in operation will cut the bar for its full width. It is then necessary to form the threat at) and in order to do so, the bar will be removed from the strip 31 and placed-upon one of the side seats according to whether.

it is desired to form a right or a left-hand chaser. This threat is always formed at the side of the bar having the beveled face il and extends'from the side edge of the bar to approximately the shoulder 4&2 which engages the shoulder 30 of the seat. The block 22 will of course be shifted upon the shaft or bar 16 to the position of Figs. '1 and 2. and the abutment nut 34 adjacent the wheel 5 will be set to the proper point so that when the bar 39 is extended it will engage this abutment nut and movement of the bar toward the wheel thus limited. The bar will be placed upon the seat and moved forwardly so that it engages the grinding wheel as clearly shown in Fig. 2 and the throat 40 will thus be ground out of the bar. After one of the chaser's has been formed a second chaser forming bar may be placed upon the strip ill and the end ground and the bar is improper engagement with the emery wheel, proper adjustment being of course made to obtain the proper contact between the wheel and the chaser bar or tool. The block can then be moved and the chaser tool placed upon the side seat and moved into proper engagement with the emery wheel. The abutment nut will then be brought into engagement with the end of the chaser and the device will be set to reproduce the chaser which it is desired to duplicate, It will thus be seen that there has thus been provided a device for use in connection with an emery wheel so constructed that a thread chaser may be easily, quickly and very accurately ground. It will be further seen that there has been provided a device so con structed that it may be used in connection with a conventional structure of emery wheel stand.

I claim:

1. A device of the character described comprising a bearing bracket, a socket having a stem engaged by the bearing bracket, a shaft adjustably engaged by the socket, a block slidably fitting upon said shaft and held against rotation thereon, abutment collars carried by the shaft upon opposite sides of the block, said block having its upper face cut to provide a central seat and side seats upon opposite sides of the central seat, the side seats being cut at an incline and having longitudinally extending ribs providing abutment shoulders, a strip hingedly mounted in the central seat, a set-screw extending upwardly through the block and engaging the strip, threaded stems extending from the block from the forward end thereof and in front of said side seats, and abutment nuts screwed upon the threaded stems.

2. A device of the character described comprising abearing bracket adapted for connection with a lathe stand, a socket having a stem engaged by said bearing bracket, a shaft engaged by the socket and releasably held against rotary and longitudinal movement, a block mounted upon said shaft and adjustable longitudinally thereof and held against rotary movement thereon, said block having a central seat and a sideseat, the side seat being cut at an incline, a supporting strip positioned in the central seat and pivotally mounted at one end, a set screw passing through the block and engaging the underface of the strip to support the same at a desired angle, and abutments adjustably mounted in front of the side seats.

3. A device of the character described comprising a support including a socket and a shaft carried by the socket, a block slidably mounted upon the shaft, said block having a central seat and side seats, a supporting strip positioned in the central seat and pivotally mounted at one end for vertical adjustment therein, means for support ing the strip at a desired angle, threaded stems extending from the block in front ofthe side seats, abutment nuts carried by the threaded stems, and resilient means positioned upon the stems for engaging the block and abutment nuts and frictionally holding the abutment nuts against rotation.

4:. A device of the class described comprising a bearing bracket, a socket connected therewith for lon itudinal and rotary movement, means for clamping the bearing bracket in tight engagement with the socket member to hold the same against movement, a shaft carried by the socket member for longitudinal and rotary movement, means for clamping the socket member to hold the shaft against movement, a block adjustably mounted upon the shaft for movement longitudinally thereof, means for releasably holding the block in an adjusted position upon the shaft, said block having a seat adjacent one side and a seat intermediate its width, a supporting strip mounted in the last named seat for angular adjustment therein, and an abutment adjustably mounted in advance of the first named seat for limiting forward movement of material operated upon beyond the forward end of said block.

5. A device of the character described comprising a support including a shaft, a block mounted upon the shaft and held against rotation thereon and permitting of longitudinal sliding movement, collars positioned upon the shaft upon opposite sides of the block and releasably held against movement thereon, set screws passing through the collars and engaging the sides of the block to retain the same firmly in position whenin engagement with the block, and said block being cut from its upper face to provide a central seat and side seats, an adjustable support positioned in the central seat, and adjustable abutment means positioned in front of the side seats.

6. A device of the character described comprising a support including a horizontally disposed shaft, the support being provided for vertical and horizontal adjustment, a block mounted upon the shaft for longitudinal adjustment thereon, said block being cut from its upper face to provide a central seat and side seats, the side seats being cut to extend forwardly at an upward incline, a supporting strip positioned inthe central seat and pivotally mounted at its forward end, and abutment means mounted in front of the side seats and adjustable toward and away from the same.

7. A device of the character described comprising a bearing bracket adapted for connection with the lathe stand including a rotatably mounted shaft and a grinding Wheel. upon the shaft, a socket carried by the bearing bracket for vertical adjustment and turning movement, a bar carried by the socket member for extending transversely of. the grinding Wheel, a block mounted upon the bar for longitudinal adjustment thereon, said block being provided with a central seat and side seats, and a support positioned in the central seat and pivotally mounted therein. 10

In testimony whereof I have hereunto set 

